Ceiling of Gamma(n+4/5)/Gamma(4/5).

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =16a(5) =74a(6) =427a(7) =2901a(8) =22625a(9) =199095a(10) =1951128a(11) =21072176a(12) =248651669a(13) =3182741352a(14) =43921830648a(15) =650043093589